Lifting jack



Feb. 8, 1927.

W. G. RITCHIE LIFTING JACK Filed Feb. 10, 1926 2 Sheets-Sheet l Feb. 8 '1927. 1,616,550

W. G. RITCHIE LIFTING JACK Filed Feb. 10, 1926 2 Sheets-Sheet 2 50 are used. In the lower end of WILLIAM G. RITCHIE, OF SALT LAKE CITY,

v anacea rear crates.

UTAH.

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LIFTIHG JACK.

Application filed February 10, 1926. Serialibl'o. 87,278.

This invention relates to a two-fold jack, andhas for one of its objects the lifting of a load in less time and with less power than the jacks now used.

Another object of this invention is to provide a new means for rising the jack, with cams, a block and tackle operated by a set of gears within a handle of the jack.

lVith these and other objects in View, my

invention consists of the following arrangement, of parts illustrated in the drawings, in which- Figure 1 is a side'view of my invention showing it in a raised position as in raising a lIo ad. 1 Fig:

Fig.

2, is a side view of a saddle 15. 3, is an end view of a cap 7. 4, is a plan view of cap 7. Fig. 5, is a plan view of the invention.

Fig. 6, is a view on line 6-6 Fig. 7. Fig. 7, is a side view of the invention showing the jack closed.

Fig. 8, is a view on line 8-8 Fig. 7, showing a plan of block and tackle.

Similar letters and numerals refer to like parts throughout the several views of the drawings.

The reference character, A denotes the front, B the back. so The invention comprises a base having a vertical pr0 ection 1 thereon,

has a slot 2 in each side thereof and a slot 3 in the front and back thereof. Each corner of the projection 1 has a hole 4 therein extending the full length thereof. On the front and at each side of the slot 3 is a project-ion 5 which has a slot (3 therein.

A removable cap 7 is placed on the top of the vertical projection 1. Projecting from the bottom of cap 7 is 9 therein. In the corners of the. cap 7 is placed a hole 13 into which is secured a bolt or red 12 that operates within the holes 4 of the projection 1. On each side and in the center of the cap are other holes 11 through which the legs 14 of the saddle 15 pass through and into the slots 2.

In the lifting of the saddle 15 two cams cam 16 is placed a pin or hearing 18 and in the upper end of cam 17 is also placed a pin or bear-. ing 18', see Fi 1.

In the face of each cam is a groove 19 and in the outer end of each cam a pin 20 is placed over which one end of cables 21 is sesaid proj ection I a lug 8 which is placed within the slots 3 and has a notchcured. When thejack is closed the cable will be within the grooves 19. After the cables have been attached to the pin 20 the other ends are placed through the slots 3 and then secured to a ring 22 which is placed over a hook 23. I

Slidably secured to the projections 5 is a socket 27 which receives one end of the handle 26. This socket is secured to the slot by' a pin 50 in the sides thereof which slides within the slot'6. fhe handle 26 is removable from said socket when jack is not in use. Within the handle is placed a block and tackle eomprisinga drum 47 having teeth 28 on one side thereof which mesh with teeth on a driving gear 29 A. pulley 25- is journaled within said handle by a' shaft 41 to which one end of a cable 42 is attached. The cable passes under a pulley 24 and then over the pulley 25 and then down under the pulley 24 and then over to the drum 47 to which the end is secured. To the journal of the pfilley 24 is pivotally placed the book 23. To the shaft of the driving gear 29 is attached a crank 35 for operating the block and tackle. A pawl 34 is placed within the handle to engage the teeth of the gear 29 to prevent the unwinding of the drum when the jack is raised.

In the operation of the invention, the

ring 22 is placed on the hook 23. The handle isthenplaced into socket 27. Crank handle 31 is now operated to wind cable 42 onto drum 47 which draws pulley 24 toward the drum which in turn draws on cables 42 to bring the outer ends of cams 16 and 17 together. In this movement cam 16 pivots on pin 18 hearing in slot 3. The pin 18 on cam 17 raises and moves saddle upward to notch 9 in cap 7. The pin now enters the notch 9 to lift cap 7 upward which will raise bolts 12 in holes 4 to the height .of the lift of the cams. In turning handle 31 it operates gear 29 which in turn operates drum. 47. Pawl 34 catches in teeth of gear 29 and locking said ear to prevent the unwinding of said cable on the drum..

To lower saddle, pawl. 34 is removed out of the teeth of gear 29 and the handle 31 is turned in the opposite direction from the raising thereof.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A. lifting jack comprising a base having an upright thereon, said upright having ing said cams, all

pair of cams pivotally mounted in said base,-

one of said cams being abovethe other of said cams, each of said cams have a groove in the face thereof and a pin in the outer end thereof to which is attached a cable, said cable passing through said grooves when said jack is in a closed position, the other end of said cables has a ring thereon which is placed over a'hook in the handle of said jack, means in said handle for operating said cam and means for locking said cams when the jack has a' load thereon, all substantially as set forth.

3. A lifting jack comprising a base having slots therein, a pair of cams'operating in said slots, each of said cams" ave a groove therein in which is placed a cable'one end thereof being attached to its cam and the other end thereof being attached toa ring, said jack having a removable handle slida hole in each cornerably secured to said base, a block and tackle Within said handle, said ring to be placed on a hook of said block and tackle, said block and tackle to draw on said cables and bring the outer ends of the cams together for the raising of the jack and means for locking said jack when in a raised position, all substantially as set forth.

4. A lifting jack comprising a base having slots therein and holes in the corners thereof, a cap for said base having rods projecting therefrom, said rods to fit within said holes, a cam pivotally operated in said grooves, another cam slidably operative in said grooves, a saddle having legs thereon, said legs passing through holes in said cap into said slots and resting upon a pinin said other cam, a removable handle slidably mounted on said base, a block and tackle within said handle, means attached to said cams and to said block and tackle for operating said cams to raise said saddle, means on' said handle for operating said block and tackle and means for locking said cams in a raised position, all substantially as set forth.

In witness whereof I aflix' my signature.

WILLIAM G. RITCHIE. 

